1. Atomic Physics Compton scattering Renjith Mathew Roy George Christopher Saqib Majeed Lone Dr.JOHANAN CHRISTAIN PRASANA

2. Purpose of talk 1.Introductory explanation 2.Experimental findings 3.Compton wavelength

3. Renjith Mathew Roy Compton Scattering

4. Particle nature of wave-De Broglie and Einstein

5. What happens when photons interact with matter?. Photoelectric effect. At energy of few KeV(visible region), Photons can be completely absorbed and can excite electrons Pair production High energy photon may bombard with nucleus and causes electron and positron to formed. Scattering At an intervening energy of photons, scattering occurs ionisation energy

6. Explanation given by Thomson-(Thomson scattering) Electron beam

7. CLASSICAL IDEA OF SHIFT IN WAVELENGTH

8. To a new way of understanding... It is good for long wavelengths, and leads to an understanding of why the sky is blue – Rayleigh scattering. It fails for short wavelength (Eg:x-rays) scattering(high energy beam) FAILURE OF SHORT WAVELENGTH SCATTERING The classical scattering of is modified by quantum effects when the energy of the incident photons becomes comparable with the rest mass of the scattering particle,. This scattering of a photon by a charged particle will take us to Compton scattering,

9. COMPTON’S EXPLANATION Logo here

10. Definition When X-ray of a sharply defined frequency where incident on a material of low atomic number like carbon, they suffered a change of frequency on scattering.The scattered beam contains two wavelengths.The change of energy is due to the loss of energy of the incident X-rays’. This elastic interaction is known as Compton scattering. concluded by stating: EM waves were behaving like photon particles having energy hf and momentum hf/c. acting in a straight line

11. Compton wavelength P.George Christopher

14. The Experiment Saqib Majeed Lone

15. EXPERIMENTAL SETUP source target

16. The scattering!

17. COMPTON SCATTERING DATA

19. THANK YOU